Ring lapping machine



2 Sheets-Sheet 2 waif 1/406 TYY INVENTOR. (liar/cs i. fu

June 19, 1945. c.'A. FULMER RING LAPPING MACHINE Filed May 32', 1944 Patented June 19 1.945

1 UNITED STATES PATENT OFFICE Y 7 2,378,696 I I RING LAPPING MACHINE Charles A. Fulmer, Fort Thomas, Ky. Application May 2, 1944, Serial No. 533,7

7 Claims.

This invention relates to lapping machines and is directed to improvements-in a machine of this character which is particularly useful in accurately adapting a set of piston rings for immediate use in its particular motor cylinder.

It is an object of the invention to provide a small, simplified machine which has an efficient ring-lapping movement wherein the replacement rings are reciprocated within their actual motor cylinder and during said'reciprocation provides said rings with a rotary feed stroke movement,

and a non-rotary return stroke movement.

Another object of the invention is to provide in an alternate rotary and non-rotary reciprocating mechanism fora piston ring lapping machine, a means whereby the movement of the ring carryingv member traverses a different portion within the cylinder with each cycle of its movement.

- 'It is a further object of the invention to pro.-

.videin a lapping machine a threaded control means which is rotatably journaled on a machine base for mounting a reciprocating threaded, toolcarrying member, an overrunning clutch being interposed between the base and the control means for precludingrotation of said means to permit rotation of the tool carrying means in one phase of its movement and, to also provide a second overrunning clutch which precludes rota-tion of'the tool-carrying means and permits rotation of the control means in the opposite phase of movement of the tool-carrying means.

Other objects of the invention will be apparent from the following specification and drawings which describe andillustrate the preferred embodiment of my invention and in which: 7

Fig.1 is a side elevational view of my ring lapv ping machine, a motorcylinder andits mounting anintegral Sandi-m l0 positioned at the end thereof. This standard has a circular opening ll formed therein. for receiving the inner skirt provided with a handle l9 which upon rotation turns the cam surface against an extended portion 20 on the standard to thereby tilt the lever and clamp the inner end N5 of the lever to the flange. v

A ring carrying member is provided with a spirally formed surface which may take the form of a shaft 2 I which as shown in Fig. 4 is substantially square in cross-section; the four fiat sides of said shaft forming a spiral speed screw which extends the'entire lengthof said shaft. As indicated in Figs. 1 and 2 each one of the spiral surfaces passes through an arc of 180 as they trav erse the longitudinal distance of the'shaft." :A

standard being shown in central cross-section.

I Fig. '2 is a. plan view of the machine, parts thereof being shown diagrammatically.

Fig. 3 is an enlarged cross-sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a cross-sectional view taken on line 4-4 of Fig. 3. 4

Fig. 5 isa cross-sectional view taken on line 5-'-5 of Fig. 3. J

The machine illustrated in the drawings is adapted to lap a set of new or replacement rings into the actual motor cylinder 1 in which they are to be subsequentlyused. This cylinder may be commercially used inaviation engines of' the radial type'and is provided with abolting flange ring mounting member 22 is fixed coaxially on the outer end of the shaft by means of a nut 23 which cooperates with a threaded stud 230-extending from the shaft end, said member being provided with a number of peripheral grooves 24 for receiving the rings 6. The ringi'nounting member is a duplicate or facsimile of themotor piston for the cylinder 1 and for all practical purposes a discarded piston of the proper specification maybe usedby drilling a centrally disposed hole through its web portion for receiving stud 230: The piston is also provided with. a number'of thin pins i iil'which extend from the bottom of the grooves 24 and are adapted to engage the adjacent edges of the split piston rings held in said grooves to preclude rotation of said rings relative to the piston when it is reciprocated within the motor cylinder 1.

This ring carrying member is guided for rectilinear movement in a bearing block 25 mounted on the base by means of legs 26 and 21. The bearing block has a cylindrical opening 28 formed therein which is disposed coaxially with the shaft 2| and the cylinder opening H formed in the standard Ill. As most clearly shown in Figs.3 and 4 acontrol meanstakes the form of a sleeve 29 rotatably journaled in the opening 28 and has formed through its axial center a spiral; thread 30 for slidably engaging the threaded shaft 2| of the ring carrying member. The sleeve is held against axial movement within the block by a shoulder 3! and an oppositely disposed threaded end portion 32 which cooperates with a lock nut 33. A circular oil chamber 300 is formed in the block around the sleeve 29, a wick 30! passing through said sleeve to carry oil from the chamber to the spiral shaft 2|.

The ring carrying member is adapted for rectilinearly directed reciprocating movement with: in the cylinder 1 by means of a suitable motor 34. This motor takes the form of an elongated cyl:

inder 35 mounted at its inner end on a block 36 fastened to the base. This cylinder has a piston 31 movable therein which is connected toa piston rod 38. The free end of the rod is rotatablyconneoted to the inner end of the spiral shaft 2! and as shown in Fig. 3, said inner end of the shaft is provided with an internally threaded portion 39 wh h terminates a ne 99d n a s re ee 'i is' ll T e' edeiisrorm wit a redu ed po ion havin a e r i er ehei e 4.? p s. line s xtr mist sh iiie i is tt ii t hel e re i ie $9 n th ei eit err .isin a utm n with a t rus ee ii'ie d k 49 sr e bo om 'ei lee se ms; f i e h ii l e 4? were e d n v ning 4!! aee n eii e evei b n 9? eelii'i 5 Revise W d nt iee eeitieiie e d w ie te m a 'e'en tra ep' nii s .4 we them e ee se e he ret re s P 'ii ee i th l ed and are e ei e w h eerie: t ea s is? e e ereii r with the interior threads '33 formed in the rod 2].

Th ireciprocatir' ig motion is' im arted to' the i e i e v ree e 1e: e ififiieii e li ei'eiiliystemprbvmed with a motor driven pump the intake port erwmcn is" connected to sump tank 50 by a pipe line, 5|. The pressure line '52 for t bums se fihe ted 9 i'ee il ti tw wey wai ers mounted ori'the'base M A H L n ief ein' r e ore l va v .4 e -veer n'tl y diseas s on tlie'basfe. r ss re re ief jv'siiz 520 s'c 'inectedin tneipressureiipe s? e;

ween 'iii 'iiii'i iii i d ii e -e ii iie e T ie el e ejl is s ee ei 's s iee r leed ef an e r t he. slime 'i ji lkl "sire? .2L pr ss e iii ee liv ree y the smi e in e eeee ef the es lir etting of the volume control valve. P s re lines .5. nd e eeii eete m res ve e I eemmuni et wii e tee e ee wsr ie-ih e in e a d ent r e s the der .re eee e y- An e hau t line e iiii ei th We-ye valve and the sump tank. The pipes 55 and are alternately and simultaneously constituted ressu e and xhaus ines f r h ir e peetive QY nd end b ns e e eent e lever Whiel is a a d. y a d 59 t n in om a en ered .6 mounted for e tili movement tween th lo k and. B- T o arri s tw e eit eli na ly adjustab e stor s a d 52 ic erm ne the length of the stroke for the ring carrying member by engaging a shoulder 5,; formed on the piston rod 38.

It will therefore e no ed that the hydraulic motor imparts a succession of feed and return strokes to the ring carrying member and the means for imparting a rotary movement and a non-rotary movement to the member in itsop posite reciprocating phases will now; be described. he m ans. for obtainin ar mev me t 9? he membe preferably ur n its ee s r ke s 919 eiii by an e e inni eliiteh whi h 9% pri s e eh ra e 69 Fi s- 3 we W iei i fixed ie e S e 19 by k 5: 'iiieelsi ii s ,9

and'has' inter tatably mounted in a circular opening 66 formed in a clutch plate 61 the latter being fixed to the inner face of the block 25 by bolts -68. Two tangentially disposed passageways 69 and 10 are formed in the plate and are restricted at their inner'ends by the interposition of the peripheral surface of the race 64. take the form of balls H are disposed in the passageways and are urged toward the restricted portions by means of springs 12 held therein by threaded gees 13. Upon initiation of the feed stroke movement of the ring carrying member the sleeve 29 is held against counter-rotation imposed on it by the threaded screw by means of the ,clutchi r g elements so that rotary movement is imparted to said member by the longitudinal movement of the spiral shaft through the rigidly lie d s eve 38- Th return stroke of the ring carrying member is adapted to be a non-rotary one and to this nd 3! $993M QVQ UQI u h i nt r leey e i 'eiiea t ens th ba e we eemprieee e eei ee tr e l i i r pe t e l 7 rm d o he in.- l ei em 9? the shaf 2! Wiesend A eluieh plate 5 ie erevie ed wit 1 e neenii e e e e ei i l6 er eiete lv' r ce v th eiieiiiei Per i? rmed en the s a t it d e m We? e sie i li e eiiii 7 e r ed he n fer freely engaging a'guide shaft 18 mounted between iii. Plee e 12-5 the 5- Thi l e plate is i q with re tr e e 5 ir fi y 73 n 30 i which'the circular portionon the shaft extends, suitab se eel eli eh s ement .8 being i ther and urgedtoward the restricted rer ei 9 s t e ieeee e b mean of i s it During the r tire e reke e he ri eerie 1 he e e i ieh ii elem nts e h h it eeei ret tien. nd e m t be be d aw through the sleeve 29 causing the sleeve to rotate i e ii j let hed si i n r lat e ie the emb em "H puring thefeed stroke the clutch elements i! eeriii t'j e e' ie bet een the le eh l e 15 f s he eirei ler mi ion 14 en t e he-f it i w l ih r iere b ee tha h iit m ns $9? th a e carr i m e s ret e tioned oh the base against axial movement and t t the .r e v se eine .ei ei m m during i s e i ieee ie s obta ned by t e eeeperetien I es e er-r nning liiteh nte os d b we n e controlmeans and the base and asecond over- 'clutohfiiositioned" between the member an the base. The over-running clutch for the sleeve control means is responsive to the counterrotatign of said sleeve when the ring carrying member begins its feed stroke and said clutch therefore locks the sleeve against rotation and the feed stroke actuation of the member imparts to it a we e i ien es he spira ee i e f iiiereei. peeees Phi-sash e isl leeked le .D f ii h feed stre s t e eee mi We -en e l h positioned at the inner end of the shaft remains inoperative to permit free rotation of said shaft. This second over-running clutch is locked in response to the initial movement of the return stroke and serves to lock the shaft relative to the clutch plate 75 which in turn is rectilinearly guided by the shaft 18, thereby precluding rotation of the ring carryin member du t aid retu n o e When the eeee q ever-run n eli i is Operative h first e st n eli ieh s reneere inoperative @951 $5. he 9 1 o r e freely n i s e ree b e n es h s a s af peesee ireiieii it it i r ilinear n ii-r teii mo ment t e the er i esie lu ehes ha e a Clutch elements which slightly delayed responsive action to the initial movement of the ring carrying member in that a slight relative movement of the associated parts is necessary to lock the clutch elements between them. This delayed responsive actiontherefore advances the ring carrying member by increments of its rotary movement within the'cylinder which is less than the full rotation which should have been imparted to it by the control means ment set of rings 6 are fitted in the grooves 24 I of the ring mounting member 22. The motor cylinder I in which said rings are to be used is then clamped to the standard 10 on the machine base by means of the clamps [4. The length of the particular stroke for the cylinder is then determined by adjustment of the stops 6| and 62 on the control rod 60. The hydraulic system is then put in operation and its reciprocating speed adjusted by means of the control valve 54 and said motor will then reciprocate the rings within the cylinder 1, the clutches serving to permit rotation of said ring carrying member during the feed stroke and to impart to the ring carrying member a non-rotary return stroke. This reciprocation is continued until the rings have been lapped to exactly fit the cylinder 1.

What is claimed is:

1. In a machine of the class described the combination of a base, a ring carrying member, means for reciprocating the member, a control means rotatably mounted on the base for journaling the member, means interposed between the base and the control means for locking said means upon movement of the member in one phase of its reciprocation, and means responsive to the return stroke movement of the member for rendering the control means inoperative.

2. In a machine of the class described the combination of a base, a threaded ring carrying member, means for reciprocating the member, a threaded sleeve rotatably mounted on the base and slidably mounting the threaded portion of the member, clutch means for locking the sleeve against rotation in one phase of the reciprocating movement of the member, and a second clutch means for locking the member against rotation in the opposite reciprocatory phase.

3. In a machine of the class described the combination of a base, a threaded ring carrying member, means for reciprocating the member, a threaded sleeve rotatably mounted on the base and slidably mounting the member, clutch means responsive to the movement of the member in one phase of its reciprocation for locking the sleeve against rotation, and a second clutch means responsive to the movement of the member in its opposite reciprocatory phase for' locking the member against rotation.

4. In a machine of the class describedthe combination of a base, a threaded ring carrying member, means for reciprocating the member, a threaded sleeve rotatably mounted on the base and slidably mounting the threaded portion of the member, an over-running clutch means interposed between the sleeve and the base and actuated to lock thesleeve against rotation only upon movement of the member in one phase of its reciprocating movement, and a second overrunning clutch means interposed between the ,base and the member and actuated to lock the member against rotation only upon movement of the member in the opposite phase of its reciprocatory movement.

5. In a ring lapping machine for motor cylinders the combination of a base, a bearing block on the base, a threaded sleeve rotatably mounted in the block against axial movement, a threaded shaft slidably engaged by the sleeve and mounted thereby for axial movement relative to the base,

means for imparting an alternate succession of feed and return strokes to the member, a standard on the base for mounting a cylinder in coaxial alignment with the shaft, a ring mounting member fixed coaxially on the end of the shaft and movable within the cylinder, a first over- "running clutch means interposed between the sleeve and the base and actuated to lock the sleeve against rotation only during the feed stroke of the shaft, and a second over-running clutch means interposed between the base and the shaft and actuated to lock the shaft against rotation only during the return stroke of said shaft.

6. In a ring lapping machine as set forth in claim 5 wherein the first over-running clutch means comprises a clutch plate fixed to the block and having a circular opening disposed coaxially with the'sleeve, a clutch race keyed to the sleeve and rotatable in the opening, a restricted passageway formed between the race and the plate, a clutch element in the passageway, and means for urging the element toward the restricted portion of the passageway.

7. In a ring lapping machine as set forth in claim 5 wherein the second over-run ing clutch means comprises a concentric circular portion formed on the end of the shaft, a clutch plate having a clutch race opening formed therein for rotatably receiving the circular portion of the shaft, means for precluding axial movement between the plate and the shaft, a guide rod on the base disposed parallel to the shaft, an arm on the plate for freely engaging the rod, a restricted passageway formed between the circular portion of the shaft and the opening in the plate, a clutch element in the passageway, and means for urging the element'toward the restricted portion of said passageway. I

- CHARLES A. FULMER. 

